EP2006941B1 - Électrode de batterie - Google Patents

Électrode de batterie Download PDF

Info

Publication number
EP2006941B1
EP2006941B1 EP08011026A EP08011026A EP2006941B1 EP 2006941 B1 EP2006941 B1 EP 2006941B1 EP 08011026 A EP08011026 A EP 08011026A EP 08011026 A EP08011026 A EP 08011026A EP 2006941 B1 EP2006941 B1 EP 2006941B1
Authority
EP
European Patent Office
Prior art keywords
active material
material layer
positive electrode
collector
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08011026A
Other languages
German (de)
English (en)
Other versions
EP2006941A1 (fr
Inventor
Chizuru Matsuyama
Takuya Kinoshita
Kyouichi Watanabe
Yoshinori Naruoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP2006941A1 publication Critical patent/EP2006941A1/fr
Application granted granted Critical
Publication of EP2006941B1 publication Critical patent/EP2006941B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a battery electrode. Especially, the present invention relates to the battery electrode capable of improving output density of a lithium ion secondary battery.
  • a hybrid car, an electric car, a fuel cell car are produced and sold, accompanied by continued new development of the above cars.
  • a power source capable of charging and discharging is essential.
  • secondary batteries such as lithium ion battery, nickel hydrogen cell and the like, electric double layer capacitor and the like are used.
  • the lithium ion secondary battery which has a high energy density and a high resistance to repeated chargings and dischargings, is considered to be preferable for use for the electric vehicle, thus leading to various on-going developments of the lithium ion secondary battery.
  • the lithium ion secondary battery has such a structure that a positive electrode and a negative electrode are connected via an electrolyte layer, which electrodes and layer are received in a cell case.
  • the positive electrode has such a structure that a positive electrode active material layer including a positive electrode active material, a conductive additive, a binder and the like is formed on each of first and second layers of a positive electrode collector
  • the negative electrode has such a structure that a negative electrode active material layer including a negative electrode active material, a conductive additive, a binder and the like is formed on each of first and second layers of a negative electrode collector.
  • the positive electrode active material layer and the negative electrode active material layer on the collectors in such a manner that the above layers each have a thickness as great as possible.
  • a first active material in the vicinity of a surface and contacting an electrolyte layer and a second active material in the vicinity of a collector are put in conditions different in electrode reaction. Therefore, it is difficult to improve output according to thickness of the active material layer by giving sufficient performance to both of the first and second active materials.
  • a battery having an electrolyte layer using any of solid polymer electrolyte and gel electrolyte has such an advantage that a liquid leak from the battery is unlikely.
  • the above electrolyte layer has a high viscosity. Therefore, in the case of a thick electrode having an active material layer greater than or equal to 100 ⁇ m, the solid polymer electrolyte and gel electrolyte each are not capable of sufficiently permeating in the active material layer, thereby, as the case may be, failing to efficiently make an electrode reaction.
  • JP9320569 discloses such a technology that an active material layer has a relatively low voidage in the vicinity of a collector while the active material layer has a relatively high voidage in the vicinity of a surface contacting an electrolyte layer, thus effectively permeating an electrolytic solution in the active material layer.
  • EP 1 662 592 A1 discloses a current collecting structure and an electrode structure of electrical components, such as batteries and capacitors. Thereby, carbon materials are formed on current collecting substrate without using binders.
  • An active material layer of a battery electrode of the present invention has such a structure that a conductive additive in the active material layer has a bulk density which is gradually decreased in a direction from a collector side of the active material layer to a surface side (i.e., electrolyte side) of the active material layer.
  • voidage in the active material layer is increased in the direction from the collector side of the active material layer to the surface side of the active material layer.
  • the above structure does not need to increase content of binder, thus contributing to increasing capacity of the battery.
  • a facial-most sublayer on the surface side of the active material layer includes the conductive additive having a high bulk density.
  • the active material layer can follow volume expansion which may be caused when contacting the electrolyte, thus preventing exfoliation of the active material layer.
  • a battery electrode comprises: a collector; and an active material layer formed on a surface of the collector and including: an active material, and a conductive additive having a bulk density which is gradually decreased in a direction from a collector side of the active material layer to a surface side of the active material layer.
  • an electrolyte layer including electrolyte is disposed on the surface side of the active material layer.
  • Fig. 1 is a schematic of a cross sectional view of a battery electrode, according to a section I of a first embodiment of the present invention.
  • a battery electrode 1 according to the section I of the first embodiment in Fig. 1 has such a structure that an active material layer 3 is formed on a surface 2A (upper in Fig. 1 ) of a collector 2.
  • main compositions of the battery electrode are an active material, a conductive additive and a binder, to be described afterward.
  • the battery electrode 1 (hereinafter, otherwise referred to as "electrode” for short) of the present invention has the active material layer 3 having such a structure that bulk density of the conductive additive is gradually decreased in a direction D from the collector side 3B to a surface side 3A.
  • the conductive additive having the bulk density which is gradually decreased in the direction D from the collector side 3B to surface side 3A of the active material layer 3 can bring about the following effects 1 and 2:
  • the conductive additive having the smaller bulk density on the surface side of the active material layer enlarges the conductive additive's volume relative to the active material's surface.
  • a high conductivity can be obtained even when voidage of the active material layer is relatively high, thus bringing about a battery electrode having a low resistance.
  • the above structure does not need to increase content of the binder, thus improving energy density of the battery, to thereby prepare a high-capacity battery.
  • the active material layer 3 may have the following structures:
  • the number of sublayers is preferably from 2 to 10 and more preferably from 2 to 5.
  • bulk density difference between adjacent sublayers is preferably from 0.03 g/ml to 0.1 g/ml and more preferably from 0.05 g/ml to 0.1 g/ml.
  • the conductive additive included in each of the sublayers may be one type of conductive additive or a combination of two or more types of conductive additives.
  • the bulk densities of the respective conductive additives included in the respective sublayers are so adjusted that weighting averages of the bulk densities of the conductive additives by compounding ratios of the conductive additives are decreased in the direction D from the collector side 3B to the surface side 3A.
  • the active material layer 3 having five or more sublayers varying compounding ratios of a plurality of conductive additives can prepare sublayers having different voidages.
  • the number of types of the conductive additives may be smaller than the number of sublayers, which is advantageous in terms of production cost.
  • the conductive additive's content in the active material layer 3 is preferably 5 mass % to 20 mass % and more preferably 10 mass % to 15 mass %.
  • the conductive additive's content in the active material layer 3 is preferably constant in the stack direction D, so as to preferably keep electron conduction in the active material layer 3.
  • the bulk density of the conductive additive included in a facial-most sublayer on the surface side 3A is preferably less than or equal to 0.05 g/ml and more preferably less than or equal to 0.04 g/ml and still more preferably less than or equal to 0.03 g/ml, which is to be described afterward.
  • the bulk density within the above ranges can effectively progress penetration of the electrolyte, thus improving the cell output.
  • a lower limit of the bulk density of the conductive additive included in the facial-most sublayer is not specifically limited, preferably however, 0.01 g/ml and more preferably 0.02 g/ml, in view of handling.
  • the voidage of the facial-most sublayer is preferably 30% to 60% and more preferably 40% to 50%. The bulk density and voidage within the above ranges can effectively progress penetration of the electrolyte, thus improving the cell output.
  • the bulk density of the conductive additive included in the sublayer contacting the collector 2 is not specifically limited, preferably 0.1 g/ml to 0.2 g/ml and more preferably 0.15 g/ml to 0.2 g/ml.
  • the bulk density within the above ranges can further decrease the voidage.
  • the voidage of the sublayer contacting the collector 2 is preferably 30% to 50% and more preferably 30% to 40%.
  • the density of the conductive additive of the intermediate sublayer(s) is preferably less than or equal to 0.1 g/ml and more preferably 0.07 g/ml to 0.08 g/ml.
  • the voidage of the intermediate sublayer(s) is preferably 30% to 40% and more preferably 35% to 40%.
  • Ratio of i) the bulk density of the conductive additive included in the facial-most sublayer on the surface side 3A relative to ii) the bulk density of the conductive additive included in the sublayer contacting the collector 2 is preferably 0.2 to 0.4 and more preferably 0.2 to 0.3.
  • the bulk density ratio within the above ranges can effectively progress the penetration of the electrolyte, thus improving the cell output
  • Fig. 2 is a schematic of a cross sectional view of the battery electrode, according to a section II of the first embodiment of the present invention.
  • the active material layer 3 of the electrode 1 is formed with a plurality of sublayers.
  • one type of conductive additive having a relatively small bulk density, preferably less than or equal to 0.05 g/ml, is used, and content of the conductive additive is gradually increased in the direction D from the collector side 3B's sublayer to the surface side 3A's sublayer. Due to the above structure, the voidage of each of the sublayers included in the active material layer 3 is increased in the direction D from the collector side 3B's sublayer to the surface side 3A's sublayer. Therefore, like the section I in Fig. 2 , the section II of the first embodiment in Fig. 2 can effectively impregnate the polymer electrolyte having high viscosity. Thereby, even in the case of an electrolytic solution having a low ion conductivity, an ion conduction path is smoothened, to thereby improve the cell output.
  • the usable conductive additive has a bulk density which is preferably less than or equal to 0.05 g/ml, more preferably less than or equal to 0.04 g/ml and still more preferably less than or equal to 0.03 g/ml.
  • the bulk density within the above ranges can effectively progress penetration of the electrolyte, thus improving the cell output.
  • a lower limit of the bulk density of the conductive additive is not specifically limited. In view of handling, however, the bulk density of the conductive additive is preferably more than or equal to 0.01 g/ml and more preferably more than or equal to 0.02 g/ml.
  • content of the conductive additive of the facial-most sublayer is preferably 5 mass % to 30 mass % and more preferably 10 mass % to 20 mass %.
  • voidage of the facial-most sublayer is preferably 30% to 60% and more preferably 40% to 50%. The voidage within the above ranges can effectively progress penetration of the electrolyte, thus improving the cell output.
  • the number of sublayers is 2 to 10 and more preferably 2 to 5.
  • content ratio specifically, i) content of the conductive additive included in the facial-most sublayer on the surface side 3A relative to ii) content of the conductive additive included in the sublayer contacting the collector 2 is preferably 1 to 3 and more preferably 1 to 2. The content ratio within the above ranges can effectively progress penetration of the electrolyte, thus improving the cell output.
  • using one type of conductive additive can form the active material layer 3 having a stack of a plurality of sublayers having different voidages, to thereby lowering material cost.
  • the battery electrode of the present invention is to be set forth, where the battery electrode 1 is applied to a lithium ion secondary battery.
  • the conductive additive in the active material layer has a bulk density which is gradually decreased in a direction from the collector side of the active material layer to the surface side of the active material layer.
  • the battery electrode of the present invention is applicable to both of the positive electrode and negative electrode.
  • the collector 2 includes such conductive materials as aluminum foil, nickel foil, copper foil, stainless (SUS) foil and the like.
  • a typical thickness of the collector 2 is 1 ⁇ m to 30 ⁇ m, but not limited thereto.
  • the collector 2 has a large area for preparing a large electrode 1 for a large battery while having a small area for preparing a small electrode 1 for a small battery.
  • the active material layer 3 is formed on the collector 2.
  • the active material layer 3 includes the active material and conductive additive which are main servants of charging and discharging reactions.
  • the active material layer 3 includes a positive electrode active material
  • the active material layer 3 includes a negative electrode active material.
  • the positive electrode active material is preferably a lithium-transition metal compound oxide, examples thereof including Li-Mn compound oxide such as LiMn 2 O 4 , Li-Ni compound oxide such as LiNiO 2 , and the like. As the case may be, an arbitrary combination of two or more of the positive electrode active materials is allowed.
  • the negative electrode active material is preferably the lithium-transition metal compound oxide set forth above or carbon.
  • Examples of carbon include natural carbon, artificial carbon, graphite carbon materials such as expansion graphite, carbon black, active carbon, carbon fiber, coke, soft carbon, hard carbon and the like. As the case may be, an arbitrary combination of two or more of the negative electrode active materials is allowed.
  • An average particle diameter of the active material is not specifically limited, preferably 0.1 ⁇ m to 20 ⁇ m, more preferably 0.1 ⁇ m to 15 ⁇ m and especially preferably 0.1 ⁇ m to 10 ⁇ m, but not specifically limited thereto.
  • the average particle diameter of the active material under the present invention is measured by means of a laser diffraction particle distribution meter (i.e., laser diffraction scattering method).
  • content of the positive electrode active material in the positive electrode active material layer is preferably 70 mass % to 99 mass % and more preferably 80 mass % to 99 mass %, while content of the negative electrode active material in the negative electrode active material layer is preferably 80 mass % to 99 mass % and more preferably 90 mass % to 99 mass %.
  • the conductive additive is defined as an additive which is mixed in the active material layer 3 so as to improve conductivity of the active material layer 3.
  • Examples of the conductive additive used in the present invention include carbon black such as acetylene black, carbon powder such as graphite, various carbon fibers such as vapor grown carbon fiber (VGCF: trademark registered), and the like.
  • carbon black such as acetylene black
  • carbon powder such as graphite
  • various carbon fibers such as vapor grown carbon fiber (VGCF: trademark registered)
  • Specific examples of the above include acetylene black such as HS100 (bulk density 0.15 g/ml), FX35 (bulk density 0.05 g/ml) and VGCF (bar-shaped) (bulk density 0.04 g/ml), graphite such as KS6 (phosphor chip) (bulk density 0.07 g/ml), Super-P (cluster-shaped) (bulk density 0.16 g/ml), SP450 (bulk density 0.1 g/ml) and SP-5030 (bulk density 0.07 g/ml), and ketjen black such as EC300J (bulk density
  • the acetylene black (AB) is categorized into i) first species (powdery, bulk density 0.03 g/ml to 0.06 g/ml), ii) second species (50% press, bulk density 0.06 g/ml to 0.11 g/ml) and iii) third species (100% press, bulk density 0.11 g/ml to 0.18 g/ml).
  • first species porosity 0.03 g/ml to 0.06 g/ml
  • second species 50% press, bulk density 0.06 g/ml to 0.11 g/ml
  • iii) third species 100% press, bulk density 0.11 g/ml to 0.18 g/ml.
  • 50% press acetylene black is prepared in such a manner that a powdery acetylene black having a first bulk density is so pressed as to have a second bulk density twice as large as the first bulk density.
  • 100% press acetylene black is prepared in such a manner that the 50% press
  • the particle diameter of the conductive additive is preferably 0.01 ⁇ m to 50 ⁇ m and more preferably 0.01 ⁇ m to 20 ⁇ m.
  • the particle diameter of the conductive additive is measured by means of a laser diffraction particle distribution meter.
  • the particle diameter is defined as the longest distance connecting both ends.
  • the conductive additive included in the facial-most sublayer on the surface side 3A preferably has a bulk density less than or equal to 0.05 g/ml.
  • VGCF, FX35 and ECP are preferable for the conductive additive included in the facial-most sublayer on the surface side 3A, where the VGCF is especially preferable.
  • Use of a bar-shaped conductive additive such as VGCF can secure conductivity while keeping the voidage high.
  • the bulk density (g/ml) of the conductive additive is calculated in the following manner.
  • thickness of the active material layer 3 is preferably 20 ⁇ m to 500 ⁇ m, more preferably 20 ⁇ m to 400 ⁇ m and still more preferably 20 ⁇ m to 300 ⁇ m. Thickness in the above ranges can preferably prepare the active material layer 3 having a plurality of sublayers.
  • each of the sublayers of the active material layer 3 is preferably 10 ⁇ m to 100 ⁇ m, more preferably 10 ⁇ m to 80 ⁇ m and still more preferably 10 ⁇ m to 50 ⁇ m.
  • Each of the sublayers having the thickness in the above ranges can prevent an exfoliation of the electrode 1.
  • the thickness in the above ranges can elongate a solution volatilization period in drying operation, thereby decreasing a possible segregation of binder in thickness direction, which is preferable.
  • the active material layer 3 (especially, a positive electrode active material layer) is formed with the first active material sublayer on the surface side 3A and the second active material sublayer on the collector side 3B according to the section I of the first embodiment in Fig. 1 , especially, a structure that the conductive additive included in the first active material sublayer is VGCF while the conductive additive included in the second active material sublayer is Super-P or SP450 can contribute to improvement of the cell output.
  • the conductive additive has a bulk density less than or equal to 0.05 g/ml and more preferably less than or equal to 0.03 g/ml.
  • VGCF, FX35 and ECP are especially preferable for the conductive additive.
  • a polymerizing initiator for initiating polymerization of the polymer may be included in the active material layer 3.
  • binder examples include polyvinylidene fluoride (PVdF), synthetic rubber and the like. Use of the binder can bind the active material to the conductive additive, thus securing the active material.
  • PVdF polyvinylidene fluoride
  • the ion conductive polymer examples include polyethylene oxide (PEO) polymer and polypropylene oxide (PPO) polymer.
  • PEO polyethylene oxide
  • PPO polypropylene oxide
  • the above polymers may be same as or different from an ion conductive polymer(s) used for the electrolyte layer of the cell to which the electrode 1 of the present invention is applied. The same polymer is, however, preferable.
  • the polymerizing initiator is added (mixed) for acting on a cross-linking base of the ion conductive polymer, so as to promote cross-liking reaction.
  • the polymerizing initiator is categorized into a photo polymerizing initiator, a thermal polymerizing initiator and the like.
  • the polymerizing initiator include azobisisobutyronitrile (AIBN) as the thermal polymerizing initiator, benzyl dimethyl ketal (BDK) as the photo polymerizing initiator, and the like.
  • Compounding ratio of components in the active material layer 3 is not specifically limited and therefore can be adjusted referring to a known technology about the lithium secondary battery.
  • the production method of the battery electrode 1 of the present invention is not specifically limited, and therefore may be determined referring to a conventional technology in the art of producing battery electrode.
  • a method of producing the battery electrode 1 is to be set forth, referring to Fig. 1 , where the battery electrode 1 has such a structure that the active material layer 3 includes a plurality of sublayers and that the bulk density of the conductive additives in the respective sublayers is gradually decreased in the direction D from the collector side 3B to the surface side 3A.
  • the electrode 1 is prepared, for example, by the following repeated operations:
  • Each of the active material slurries may include one type of conductive additive or a combination of two or more types of conductive additives.
  • a first active material slurry including one type of conductive additive may be combined with a second active material slurry including two or more types of conductive additives, such that the first and second active material slurries are stacked.
  • the solvent for preparing the active material slurry is prepared by at least two types, that is, an organic solvent and an aqueous solvent.
  • the solvent for preparing the active material slurry is prepared by at least two types, that is, an organic solvent and an aqueous solvent.
  • alternately applying the active material slurry (prepared by using the organic solvent) and the active material slurry (prepared by using the aqueous solvent) can prevent the following inconvenience even when a plurality of active material slurries are applied in an overlapped manner. a possible mixture of the layers which mixture may occur when the above layers are dissolved during the application.
  • the thus prepared stack structure is pressed, to thereby prepare the electrode 1.
  • Specific form of each of the components mixed in the active material slurry is as set forth in the above description about the structure of the electrode 1 of the present invention, and therefore detailed explanations of the above specific form are omitted.
  • the positive electrode active material is added to the slurry for preparing the positive electrode, while the negative electrode active material is added to the slurry for preparing the negative electrode.
  • Type of the solvent or mixing measure is not specifically limited, and therefore those conventionally known in the art of producing the electrode may be properly referred to.
  • organic solvent examples include N-methyl-2-pyrrolidone (NMP), dimethyl formamide, dimethyl acetoamide, methyl-formamide and the like.
  • NMP N-methyl-2-pyrrolidone
  • binders preferably point binders such as PVdF, acrylic resin, SBR (styrene butadiene rubber) and the like are used.
  • PVdF polyvinylidene fluoride
  • PVdF polyvinylidene fluoride
  • NMP is preferably used as a solvent.
  • aqueous solvent examples include SBR, acrylic resin, PTFE (polytetrafluoroethylene) and the like.
  • binders preferably point binders such as SBR, acrylic resin and the like are used.
  • the collector 2 for forming thereon the active material layer 3 is to be prepared.
  • Specific form of the collector 2 to be prepared under the present invention is as set forth in the above description about the structure of the electrode 1 of the present invention, therefore detailed explanations of the collector 2 are omitted.
  • the above prepared active material slurry is applied to the surface 2A of the collector 2 prepared above, to thereby form a coated film.
  • Measures for applying the active material slurry is not specifically limited, for example, those typically used such as self-acting coater may be used.
  • use of any of an ink jet method, a doctor blade method and a combination thereof can form a thin layer and accomplish a multi-step application of two or more of the active material slurries having various types or various contents of the conductive additives.
  • the coated film formed on the surface 2A of the collector 2 is dried, to thereby remove the solvent in the coated film.
  • Drying conditions may be properly determined according to: 1) amount of active material slurry to be applied or 2) rate of volatilizing solvent of slurry.
  • Pressing measure is not specifically limited and therefore those conventionally known may be properly used, examples thereof including calender roll, plane table press and the like.
  • a battery is formed by using the battery electrode 1 of the first embodiment
  • the battery includes at least one unit cell layer having such a structure that a positive electrode, an electrolyte layer and a negative electrode are sequentially stacked, wherein at least one of the positive electrode and the negative electrode is the electrode of the present invention.
  • the electrode of the present invention is applicable to any of the positive electrode, negative electrode and a bipolar electrode.
  • the battery including the electrode of the present invention as at least one electrode belongs to the technical scope of the present invention. It is preferable, however, that the electrode of the present invention is used to serve as all electrodes of the battery.
  • the above structure can effectively improve cell capacity and cell output.
  • the structure of a secondary battery of the present invention is not specifically limited, examples thereof including those conventionally known such as stack (flat), rolled (cylindrical) and the like.
  • electric connection (electrode structure) in the lithium ion secondary battery include an internal parallel connection and an internal series connection (bipolar).
  • adopting the stack (flat) structure for the battery can secure a long-term reliability due to seal technologies such as an easy thermocompression bonding, which is advantageous in view of cost and operability (workability).
  • a lithium ion secondary battery (internal parallel connection) and a lithium ion secondary battery (internal series connection - bipolar) of the present invention are to be set forth, but not specifically limited thereto.
  • Fig. 3 shows a typical lithium ion secondary battery, according to a section I of the second embodiment of the present invention. More specifically, Fig. 3 shows a schematic of a cross sectional view of an entire structure of a flat (stack) non-bipolar lithium ion secondary battery (hereinafter, otherwise referred to as "non-bipolar lithium ion secondary battery” or '"non-bipolar secondary battery” for short).
  • a flat (stack) non-bipolar lithium ion secondary battery hereinafter, otherwise referred to as "non-bipolar lithium ion secondary battery” or '"non-bipolar secondary battery” for short.
  • a non-bipolar lithium ion secondary battery 10 has a cell outer package 22 using a composite laminate film including polymer and metal. Joining entirety of the periphery of the laminate film through heat sealing brings about such a structure that a generating element (cell element) 17 is sealed and received in the cell outer package 22.
  • the generating element (cell element) 17 has such a structure that a positive electrode plate, a separator layer 13 and a negative electrode plate are stacked, where the positive electrode plate has a positive electrode collector 11 having first and second faces each formed with a positive electrode (positive electrode active material layer) 12 while the negative electrode plate has a negative electrode collector 14 having first and second faces each formed with a negative electrode (negative electrode active material layer) 15.
  • the positive electrode (positive electrode active material layer) 12 on the first face of the first positive electrode plate faces the negative electrode (negative electrode active material layer) 15 on the first face of the first negative electrode plate adjacent to the first positive electrode plate, thus forming a plurality of the positive electrode plates, separator layers 13 and negative electrode plates which are stacked.
  • the lithium ion secondary battery 10 according to the section I of the second embodiment has such a structure that the unit cell layers 16 are electrically connected in parallel.
  • each of outermost positive electrode collectors 11a positioned in respective outermost parts (uppermost and lowermost in Fig. 2 ) of the generating element (cell element; stack structure) 17 has one face alone that is formed with the positive electrode (positive electrode active material layer) 12. Otherwise, the structure in Fig.
  • each of outermost negative electrode collectors (not shown in Fig. 2 ) positioned in respective outermost parts (uppermost and lowermost in Fig. 2 ) of the generating element (cell element; stack structure) 17 has one face alone that is formed with the negative electrode (negative electrode active material layer) 15.
  • a positive electrode tab 18 and a negative electrode tab 19 conductive with the respective positive electrode plate and negative electrode plate are mounted to the respective positive electrode collector 11 and negative electrode collector 14 via a positive electrode terminal lead 20 and a negative electrode terminal lead 21 respectively, where an ultrasonic welding, a resistance welding or the like works for the above mounting operation.
  • the positive electrode tab 18 and the negative electrode tab 19 each are exposed outward from the cell outer package 22.
  • Fig. 4 shows a typical bipolar lithium ion secondary battery, according to a section II of the second embodiment of the present invention. More specifically, Fig. 4 shows a schematic of a cross sectional view of an entire structure of a flat (stack) bipolar lithium ion secondary battery (hereinafter, otherwise referred to as "bipolar lithium ion secondary battery” or “bipolar secondary battery” for short).
  • a flat (stack) bipolar lithium ion secondary battery hereinafter, otherwise referred to as "bipolar lithium ion secondary battery” or “bipolar secondary battery” for short.
  • a bipolar lithium ion secondary battery 30 according to the second section II of the second embodiment has such a structure that a substantially rectangular generating element (cell element) 37 for actually promoting charging and discharging reactions is sealed and received in a cell outer package 42.
  • the generating element (cell element) 37 of the bipolar lithium ion secondary battery 30 according to the section II of the second embodiment has such a structure that a plurality of bipolar electrodes 34 sandwich therebetween a separator layer 35.
  • a positive electrode (positive electrode active material layer) 32 of the bipolar electrode 34 opposes a negative electrode (negative electrode active material layer) 33 of the adjacent bipolar electrode 34.
  • the bipolar electrode 34 has a collector 31 having a first face formed with the positive electrode (positive electrode active material layer) 32 and a second face formed with the negative electrode (negative electrode active material layer) 33.
  • the bipolar lithium ion secondary battery 30 has such a structure that the generating element 37 includes a plurality of bipolar electrodes 34 which are stacked via the separator layers 35.
  • the positive electrode (positive electrode active material layer) 32, the separator layer 35 (adjacent to the positive electrode 32) and the negative electrode (negative electrode active material layer) 33 (adjacent to the separator layer 35) form a single unit cell layer 36 (otherwise referred to as "cell unit” or "unit cell”).
  • the bipolar lithium ion secondary battery 30 has such a structure that the unit cell layers 36 are stacked.
  • the periphery of the unit cell layer 36 has a seal portion (insulator layer) 43 for preventing a liquid junction attributable to the electrolytic solution leaking from the separator layer 35. Providing the seal portion (insulator layer) 43 can insulate the adjacent collectors 31 from each other, and prevent a short circuit which may be caused by a contact between the adjacent positive electrode 32 and negative electrode 33.
  • an outermost positive electrode side electrode 34a and an outermost negative electrode side electrode 34b of the generating element (cell element) 37 may have a structure other than a bipolar electrode.
  • the electrodes 34a, 34b may have the respective positive electrode (positive electrode active material layer) 32 and negative electrode (negative electrode active material layer) 33 each disposed only on the first face which is necessary for one of the respective collectors 31a, 31b (or terminal plates).
  • the positive electrode (positive electrode active material layer) 32 may be disposed only on the first face of the positive electrode side outermost collector 31a in the generating element (cell element) 37.
  • the negative electrode (negative electrode active material layer) 33 may be disposed only on the first face of the negative electrode side outermost collector 31b in the generating element (cell element) 37.
  • the bipolar lithium ion secondary battery 30 has such a structure that a positive electrode tab 38 and a negative electrode tab 39 are connected respectively to the positive electrode side outermost collector 31a (uppermost) and the negative electrode side outermost collector 31b (lowermost), when necessary, via a positive electrode terminal lead 40 and a negative electrode terminal lead 41 respectively.
  • extension of the positive electrode side outermost collector 31a may serve as the positive electrode tab 38 to be lead out of the cell outer package 42 which is a laminate sheet
  • extension of the negative electrode side outermost collector 31b may serve as the negative electrode tab 39 to be lead out of the cell outer package 42 which is a laminate sheet
  • the bipolar lithium ion secondary battery 30 may have such a structure that the generating element (cell element; stack structure) 37 is enclosed in the cell outer package 42 (outer package) in a depressurized manner and the positive electrode tab 38 and the negative electrode tab 39 are taken out of the cell outer package 42.
  • the basic structure of the bipolar lithium ion secondary battery 30 has a plurality of stacked unit cell layers 36 (cell units or unit cells) connected in series.
  • each of the non-bipolar lithium ion secondary battery 10 and the bipolar lithium ion secondary battery 30 is substantially the same, except that the electric connection (electrode structure) in the lithium ion secondary batteries 10, 30 are different from each other, i.e., "connected in parallel” for the former while “connected in series” for the latter.
  • the non-bipolar lithium ion secondary battery 10 and bipolar lithium ion secondary battery 30 of the present invention can be used for pack batteries and vehicles.
  • Fig. 5 shows a typical lithium ion secondary battery, that is, a perspective view of a flat stack non-bipolar or bipolar lithium ion secondary battery, according to a section III of the second embodiment of the present invention.
  • a flat stack lithium ion secondary battery 50 is flat and rectangular, with first and second sides thereof formed respectively with a positive electrode tab 58 and a negative electrode tab 59 for taking out electric power.
  • a generating element (cell element) 57 is packed with a cell outer package 52 of the lithium ion secondary battery 50 and has a periphery which is heat sealed. The generating element 57 is sealed in such a state the positive electrode tab 58 and the negative electrode tab 59 are pulled out.
  • the generating element (cell element) 57 is a counterpart of each of the generating element (cell element) 17 of the non-bipolar lithium ion secondary battery 10 in Fig.
  • the generating element (cell element) 57 is a stack of the unit cell layers 16, 36 including the positive electrodes (positive electrode active material layers) 12, 32, separator layers 13, 35 and negative electrodes (negative electrode active material layers) 15, 33.
  • configuration of the lithium ion secondary battery of the present invention is not specifically limited to being stacked and flat as shown in Fig. 3 and Fig. 4 , other examples thereof including rolled lithium ion secondary battery which is cylindrical. Otherwise, the above cylinder may be modified into a rectangular flat configuration.
  • the above cylindrical lithium ion secondary battery may have an outer package using a laminate film or a conventional cylindrical can (metal can).
  • the sides for taking out the positive and negative electrode tabs 58, 59 are not specifically limited to those shown in Fig. 5 .
  • the positive and negative electrode tabs 58, 59 may be taken out from the same side. Otherwise, a plurality of positive electrode tabs 58 and a plurality of negative electrode tabs 59 may be taken out from first and second sides respectively.
  • the cylindrical can (or metal can) can replace the positive and negative electrode tabs 58, 59.
  • the lithium ion secondary battery of the present invention can be preferably used for a vehicle driving power source or an auxiliary power source for causing demanded high volume energy density and high volume output density.
  • Liquid electrolyte or polymer electrolyte may be used for the electrolyte layers 13, 35.
  • the polymer electrolyte can bring about the effect of the electrode of the present invention.
  • the liquid electrolyte has such a structure that a lithia water (lithium salt) as a supporting electrolyte is dissolved in an organic solvent as a plasticizer.
  • the organic solvent as the plasticizer include carbonates such as ethylene carbonate (EC), propylene carbonate (PC) and the like.
  • the supporting electrolyte (lithia water or lithium salt) include compounds such as LiBETI which compounds can be added to the active material layer.
  • the polymer electrolyte is categorized into a gel electrolyte including electrolytic solution and a solid polymer free from electrolytic solution.
  • the gel electrolyte has such a structure that the above liquid electrolyte is injected in matrix polymer made of ion conductive polymer.
  • ion conductive polymer used as the matrix polymer include: polyethylene oxide (PEO), polypropylene oxide (PPO), polyethylene glycol (PEG), polyacrylonitrile (PAN), polyvinylidene fluoride - hexafluoropropylene (PVdF - HEP), polymethyl methacrylate (PMMA), and a copolymer thereof.
  • the above polyalkylene oxide polymers can dissolve electrolytic salt such as lithium salt (lithia water).
  • Examples of the ion conductive polymer include polyalkylene oxide polymers such as polyethylene oxide (PEO), polypropylene oxide (PPO), and a copolymer thereof.
  • polyalkylene oxide polymers such as polyethylene oxide (PEO), polypropylene oxide (PPO), and a copolymer thereof.
  • polypropylene oxide examples include polypropylene oxide (PPO).
  • a separator may be used for the electrolyte layers 13, 35.
  • configuration of the separator include fine porous film made of polyolefin such as polyethylene, polypropylene and the like.
  • PEO polyethylene oxide
  • the matrix polymer of the gel electrolyte and the matrix polymer of the solid electrolyte can bring about an excellent mechanical strength.
  • a polymer i.e., PEO or PPO
  • polymerizing operations such as thermal polymerization, ultraviolet polymerization, radiating polymerization, electron beam polymerization and the like by using a proper polymerizing imitator.
  • the seal portion (insulation layer) 43 is not specifically limited, examples thereof including urethane resin, epoxy resin, polyethylene resin, polypropylene rein, polyimide resin, rubber and the like.
  • the urethane resin and epoxy resin are preferable in view of corrosion resistance, chemical resistance, formability (film-forming property) and economy.
  • Electrodes positive electrode tabs 18, 38 and negative electrode tabs 19, 39
  • materials for the tabs are not specifically limited, and therefore those conventionally used for tabs for bipolar batteries may be used, examples thereof including aluminum, copper, titanium, nickel, stainless steel (SUS) and an alloy thereof.
  • SUS stainless steel
  • the same material(s) or different materials may be used among the positive electrode tabs 18, 38 and the negative electrode tabs 19, 39.
  • extension of the outermost collectors 31a, 31b like those according to the second section II of the second embodiment may serve as tabs 18, 38, 19, 39, or otherwise prepared tabs may be connected to the outermost collectors.
  • the above batteries 10, 30, 40 of the respective Sections I, II, III of the second embodiment are used for forming a battery module.
  • a battery module of the present invention has such a structure that a plurality of lithium ion secondary batteries of the present invention are connected together, more in detail, two or more of the lithium ion secondary batteries are connected in series, parallel or both. Connecting the lithium ion secondary batteries in series or parallel can arbitrarily adjust capacity and voltage of the batteries. Otherwise, the battery module of the present invention may have such a structure that the non-bipolar lithium ion secondary battery (or batteries) and bipolar lithium ion secondary battery (or batteries) of the present invention are connected in series, parallel or both.
  • Fig. 6A, Fig. 6B and Fig. 6C show a typical battery module, according to the third embodiment of the present invention, where Fig. 6A is a plan view of the battery module, Fig. 6B is a front view of the battery module and Fig. 6C is a side view of the battery module.
  • a battery module 300 of the present invention has such a structure that a plurality of lithium ion secondary batteries are connected in series or parallel, thus forming a small battery module 250 which is attachable and detachable. Moreover, a plurality of small pack batteries 250 are connected in series or parallel, to thereby form the high-capacity and high-output battery module 300 which is proper for a vehicle driving power source or an auxiliary power source for causing demanded high volume energy density and high volume output density.
  • the battery 10 of the second embodiment or the battery module 30 of the third embodiment is installed in a vehicle.
  • a vehicle of the present invention includes the lithium ion secondary battery of the present invention or the battery module which is a combination of a plurality of above lithium ion secondary batteries.
  • the lithium ion secondary battery or the battery module which is a combination of a plurality of lithium ion secondary batteries can be used for a driving source of the vehicle.
  • Examples of the vehicle having a long life and a high reliability include four wheelers such as hybrid car, fuel cell car and electric car; two wheelers (motor bike); three wheelers and the like, where the four wheelers including passenger car, truck, commercial vehicle such as bus, mini vehicle and the like.
  • the application of the lithium ion secondary battery or battery module of the present invention is not specifically limited to car, other examples including various power sources of mobile bodies such as electric trains, installed power sources such as non-outage power source, and the like.
  • Fig. 7 is a schematic of a car including the battery module, according to the fourth embodiment of the present invention.
  • the battery module 300 is installed below a seat of a central part of a body of an electric car 400. Installing below the seat can keep a spacious passenger space and a wide trunk.
  • the position for installing the battery module 300 is, however, not limited to below the seat, other examples thereof including below a rear trunk, in a front engine room and the like.
  • the electric car 400 including the above battery module 300 has a high durability and keeps a sufficient output for a long-time operation.
  • the above battery module 300 works for providing an electric car, a hybrid car and the like which are excellent in fuel economy and traveling performance.
  • the above battery module 300 is also applicable to a hybrid car, a fuel cell car and the like, other than the electric car 400 in Fig. 7 .
  • a lithium nickel oxide (LiNiO 2 ) (average particle diameter 15 ⁇ m) (70 mass %) as a positive electrode active material and a KS6 (average particle diameter 5 ⁇ m) (20 mass %) serving as a conductive additive and having a bulk density of 0.07 g/ml, and polyvinylidene fluoride (PVdF) (10 mass %) as a binder were mixed, and then a proper amount of N-methyl-2-pyrrolidone (NMP) as a slurry viscosity preparing solvent was added to the thus mixed, to thereby prepare a first positive electrode active material slurry.
  • NMP N-methyl-2-pyrrolidone
  • an aluminum foil (thickness: 20 ⁇ m) as a positive electrode collector was prepared.
  • the second positive electrode active material slurry prepared above was applied by a weight of 20 mg/cm 2 by means of a self-acting coater or a die coater, to thereby form a coated film. Then, the thus coated film was dried.
  • the first positive electrode active material slurry was applied by a weight of 20 mg/cm 2 by means of a self-acting coater or a die coater, to thereby form a coated film. Then, the thus coated film was dried.
  • first positive electrode active material layer had a thickness of 87 ⁇ m while the layer of the second positive electrode active material slurry (hereinafter referred to as "second positive electrode active material layer'') had a thickness of 85 ⁇ m.
  • a hard carbon (average particle diameter 20 ⁇ m) (90 mass part) as a negative electrode active material and a polyvinylidene fluoride (PVdF) (10 mass part) as a binder were mixed, and then the mixture was dispersed in an N-methyl-2-pyrrolidone (NMP)-as a slurry viscosity preparing solvent, to thereby prepare a negative electrode active material slurry.
  • NMP N-methyl-2-pyrrolidone
  • a copper foil (thickness: 10 ⁇ m) as a negative electrode-collector was prepared.
  • the negative electrode active material slurry prepared above was applied, followed by drying, to thereby obtain a coated film. Then, the thus coated film was pressed, to thereby form a negative electrode having a negative electrode active material layer.
  • the method like that according to the example 1 was repeated except that an HS 100 (average particle diameter 0.05 ⁇ m) having a bulk density of 0.15 g/ml was used as a conductive additive in the first positive electrode active material slurry, to thereby prepare each of the positive electrode and the negative electrode.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 85 ⁇ m.
  • the method like that according to the example 1 was repeated except that a vapor grown carbon fiber VGCF (average particle diameter 15 ⁇ m) having a bulk density of 0.04 g/ml was used as a conductive additive in the first positive electrode active material slurry, to thereby prepare each of the positive electrode and the negative electrode.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 86 ⁇ m.
  • the method like that according to the example 1 was repeated except that a vapor grown carbon fiber VGCF (average particle diameter 15 ⁇ m) having a bulk density of 0.04 g/ml was used as a conductive additive in the first positive electrode active material slurry and that a Super-P (average particle diameter 40 nm) having a bulk density of 0:16 g/ml was used as a conductive additive in the second positive electrode active material slurry, to thereby prepare each of the positive electrode and the negative electrode.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 86 ⁇ m.
  • the method like that according to the example 1 was repeated except that a VGCF (average particle diameter 15 ⁇ m) having a bulk density of 0.04 g/ml was used as a conductive additive in the first positive electrode active material slurry and that an SP450 (average particle diameter less than or equal to 1 ⁇ m) having a bulk density of 0.10 g/ml was used as a conductive additive in the second positive electrode active material slurry, to thereby prepare each of the positive electrode and the negative electrode.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 86 ⁇ m.
  • the method like that according to the example 1 was repeated except that an HS 100 (average particle diameter 0.05 ⁇ m) having a bulk density of 0.15 g/ml was used as a conductive additive in the first positive electrode active material slurry, to thereby prepare each of the positive electrode and the negative electrode.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 87 ⁇ m.
  • a lithium nickel oxide (LiNiO 2 ) (average particle diameter 15 ⁇ m) (75 mass %) as a positive electrode active material and a vapor grown carbon fiber VGCF (average particle diameter 15 ⁇ m) (15 mass %) serving as a conductive additive and having a bulk density of 0.04 g/ml, and polyvinylidene fluoride (PVdF) (10 mass %) as a binder were mixed, and then a proper amount of N-methyl-2-pyrrolidone (NMP) as a slurry viscosity preparing solvent was added to the thus mixed, to thereby prepare a first positive electrode active material slurry.
  • NMP N-methyl-2-pyrrolidone
  • an aluminum foil (thickness: 20 ⁇ m) as a positive electrode collector was prepared.
  • the second positive electrode active material slurry prepared above was applied by a weight of 20 mg/cm 2 by means of a self-acting coater or a die coater, to thereby form a coated film. Then, the thus coated film was dried.
  • the first positive electrode active material slurry was applied by a weight of 20 mg/cm 2 by means of a self-acting coater or a die coater, to thereby form a coated film. Then, the thus coated film was dried.
  • the thus obtained stack structure was pressed by means of a press.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 87 ⁇ m.
  • the negative electrode was prepared by the method like that according to the example 1.
  • the method like that according to the example 3 was repeated except that the lithium nickel oxide, VGCF and PVdF in each of the first and second positive electrode active martial slurries had mass ratio of 80 : 10 : 10, to thereby prepare each of the positive electrode and the negative electrode.
  • the first positive electrode active material layer had a thickness of 86 ⁇ m while the second positive electrode active material layer had a thickness of 87 ⁇ m.
  • a lithium nickel oxide (LiNiO 2 ) (average particle diameter 15 ⁇ m) (85 mass %) as a positive electrode active material and a VGCF (average particle diameter 15 ⁇ m) (10 mass %) serving as a conductive additive and having a bulk density of 0.04 g/ml, and polyvinylidene fluoride (PVdF) (5 mass %) as a binder were mixed, and then a proper amount of N-methyl-2-pyrrolidone (NMP) as a slurry viscosity preparing solvent was added to the thus mixed, to thereby prepare a first positive electrode active material slurry.
  • NMP N-methyl-2-pyrrolidone
  • an aluminum foil (thickness: 20 ⁇ m) as a positive electrode collector was prepared.
  • the second positive electrode active material slurry prepared above was applied by a weight of 20 mg/cm 2 by means of a self-acting coater or a die coater, to thereby form a coated film. Then, the thus coated film was dried.
  • the above second positive electrode active material slurry was likewise applied twice, followed by drying. Then, the first positive electrode active material slurry was likewise applied three times, to thereby form a stack of three coated layers.
  • first (outermost or facial-most) to sixth positive electrode active material layers were pressed by means of a press, to thereby form first (outermost or facial-most) to sixth positive electrode active material layers, with respective film thicknesses of 48 ⁇ m, 48 ⁇ m, 50 ⁇ m, 50 ⁇ m, 51 ⁇ m and 51 ⁇ m.
  • the negative electrode was prepared in the method like that according to the example 1.
  • a lithium nickel oxide (LiNiO 2 ) (average particle diameter 15 ⁇ m) (85 mass %), a KS6 (average particle diameter 5 ⁇ m) (10 mass %) serving as a conductive additive and having a bulk density of 0.07 g/ml, and polyvinylidene fluoride (PVdF) (5 mass %) as a binder were mixed, and then a proper amount of N-methyl-2-pyrrolidone (NMP) as a slurry viscosity preparing solvent was added to the thus mixed, to thereby prepare a positive electrode active material slurry of an intermediate sublayer.
  • NMP N-methyl-2-pyrrolidone
  • each of 1) the second positive electrode active material slurry like that in the example 4-1, 2) the above positive electrode active material slurry of the intermediate sublayer, and 3) the first positive electrode active material slurry of the example 4-1 was applied twice in this order, followed by drying, to thereby form a stack structure.
  • the thus obtained stack structure was pressed, to thereby form first (outermost or facial-most) to sixth positive electrode active material layers, with respective film thicknesses of 48 ⁇ m, 50 ⁇ m, 50 ⁇ m, 51 ⁇ m, 51 ⁇ m and 51 ⁇ m.
  • the negative electrode was prepared in the method like that according to the example 1.
  • a lithium nickel oxide (LiNiO 2 ) (average particle diameter 15 ⁇ m) (85 mass %), a Super-P (average particle diameter 40 nm) (10 mass %) serving as a conductive additive and having a bulk density of 0.16 g/ml, and polyvinylidene fluoride (PVdF) (5 mass %) as a binder were mixed, and then a proper amount of N-methyl-2-pyrrolidone (NMP) as a slurry viscosity preparing solvent was added to the thus mixed, to thereby prepare a first positive electrode active material slurry.
  • NMP N-methyl-2-pyrrolidone
  • mass ratio of lithium nickel oxide, Super-P and PVdF was set to 72 : 10 : 18, to thereby prepare a positive electrode active material slurry of an intermediate sublayer.
  • mass ratio of lithium nickel oxide, Super-P and PVdF was set to 60 : 10 : 30, to thereby prepare a second positive electrode active material slurry.
  • each of 1) the above second positive electrode active material slurry, 2) the above positive electrode active material slurry of the intermediate sublayer, and 3) the above first positive electrode active material slurry was applied twice in this order, followed by drying, to thereby form a stack structure.
  • the thus obtained stack structure was pressed, to thereby form first (outermost or facial-most) to sixth positive electrode active material layers, with respective film thicknesses of 48 ⁇ m, 49 ⁇ m, 50 ⁇ m, 50 ⁇ m, 50 ⁇ m and 51 ⁇ m.
  • the negative electrode was prepared in the method like that according to the example 1.
  • the positive electrode and negative electrode prepared in each of the examples and comparative examples were punched by means of a punch, so as to be used for test cells.
  • a polypropylene porous film (thickness: 20 um) was prepared as a separator.
  • LiBETI as lithia water (lithium salt) was dissolved, at a concentration of 1.0 M, in polyethylene oxide (PEO) polymer (molecular weight about 8500, viscosity 4000 Pa-s), to thereby prepare an electrolyte.
  • PEO polyethylene oxide
  • the negative electrode, separator and positive electrode which are obtained above were stacked in this order, and the polymer electrolyte was implanted in the separator. Then, current takeout thermals (i.e., electrode tabs) were connected to the positive electrode and the negative electrode respectively (aluminum terminal to the positive electrode while nickel terminal to the negative electrode). Then, cell elements were put in an aluminum laminate film such that the current takeout terminals were exposed outward. Then, an open part of the laminate film was sealed under a depressurized state, to thereby prepare a test cell.
  • current takeout thermals i.e., electrode tabs
  • Test cells were prepared for each of the examples and the comparative examples, to thereby implement the initial charging test and the vent test. Specifically, each of the test cells was subjected to a constant current (CC) charging, and then subjected to a constant voltage (CV) charging up to 4.2 V, totaling 15 hr. charging period. Then, the laminate was opened, followed by a vent test at room temperature. The vent test was implemented in such a manner that the cell was put on a flat plate in a vessel, with a weight put on an upper face of the vessel for depressurizing inside of the vessel.
  • CC constant current
  • CV constant voltage
  • Example 1 based on test cell output 1 of the comparative example 1
  • Examples 2-1 to 2-3 based on test cell output 1 of the comparative example 2
  • Example 3 based on test cell output 1 of the comparative example 3
  • Examples 4-1 and 4-2 based on test cell output 1 of the comparative example 4
  • Active material Weight Film thickness Active material content
  • Conductive additive content Binder content
  • Type of conductive additive Conductive additive bulk density
  • Electrolyte Energy density Output density mg ⁇ cm -2 ⁇ m % % % - g ⁇ ml -1 - - -
  • Example 1 Facial-most sublayer LiNiO 2 20 87 70 20 10 KS6 0.07 Polymer (PEO) 1
  • Comparative example 1 Facial-most sublayer LiNiO 2 20 86 70 20 10 HS100 0.15
  • Positive electrode active material content in the positive electrode active material layer is substantially the same. Therefore, the energy density of the cell is substantially the same.
  • the example 1 has an increased voidage of the first positive electrode active material layer which is the facial-most sublayer, thereby improving impregnating property of the polymer electrolyte. As a result, the example 1 is more improved in output density than the comparative example 1.
  • Positive electrode active material content in the positive electrode active material layer is substantially the same. Therefore, the energy density of the cell is substantially the same.
  • the examples 2-1 to 2-3 each have an increased voidage of the first positive electrode active material layer which is the facial-most sublayer, thereby improving impregnating property of the polymer electrolyte.
  • the examples 2-1 to 2-3 each are more improved in output density than the comparative example 2.
  • using vapor grown carbon fiber VGCF for the conductive additive of the first positive electrode active material layer increases the voidage, thus further improving the output density.
  • Total active material content of the first and second positive electrode active material layers is substantially the same. Therefore, the energy density of the cell is substantially the same.
  • the first positive electrode active material layer (facial-most sublayer) of the example 3 has greater conductive additive content, which increases voidage but secures conductivity, thus increasing output density.
  • the comparative example 4 has greater binder content than that of each of the examples 4-1 and 4-2, thereby changing the voidage. With this, the comparative example 4 has a relatively small active material content, thus decreasing output density. Meanwhile, the examples 4-1 and 4-2 each have a preferable energy density and a preferable output density.
  • the electrode of the present invention allows the polymer electrolyte to sufficiently impregnate to such an extent as to reach the active material layer's part in the vicinity of the collector (which was conventionally difficult to accomplish in the case of a thickened active material layer), resulting in an effective contribution to improvement of the output characteristic of the cell.
  • the electrode of the present invention controls voidage of the active material layer in a state that the active material content in the active material layer is kept high, to thereby prepare a high-energy density cell.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • General Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Claims (14)

  1. Electrode de batterie {1, (12, 15), (32, 33)}, comprenant :
    un collecteur {2 ; (11, 11 a), 14 ; (31 : 31 a, 31b)} ; et
    une couche de matériau actif {3, (12, 15), (32, 33)} formée sur une surface (2A) du collecteur {2 ; (11, 11 a), 14 ; (31 : 31 a, 31b)} et comprenant :
    un matériau actif, et
    un additif conducteur ayant une densité apparente qui diminue graduellement dans une direction (D) d'un côté de collecteur (3B) de la couche de matériau actif {3, (12, 15), (32, 33)} vers un côté de surface (3A) de la couche de matériau actif {3, (12, 15), (32, 33)}, caractérisée en ce que la couche de matériau actif (3) comprend au moins :
    une première sous-couche de matériau actif, et
    une deuxième sous-couche de matériau actif entre le collecteur {2 ; (11, 11a), 14 ; (31 : 31a, 31b)} et la première sous-couche de matériau actif, et
    la densité apparente de l'additif conducteur de la première sous-couche de matériau actif est inférieure à la densité apparente de l'additif conducteur de la deuxième sous-couche de matériau actif.
  2. Electrode de batterie {1, (12, 15), (32, 33)} selon la revendication 1, dans laquelle
    la densité apparente de l'additif conducteur de la première sous-couche de matériau actif est dans une plage de 0,01 g/ml à 0,05 g/ml.
  3. Electrode de batterie {1, (12, 15), (32, 33)}, comprenant :
    un collecteur {2; (11, 11a), 14 ; (31 : 31a, 31b)} et
    une couche de matériau actif {3, (12, 15), (32, 33)} formée sur une surface (2A) du collecteur {2 ; (11, 11a), 14 ; (31 : 31a, 31b)} et comprenant :
    un matériau actif, et
    un additif conducteur ayant une densité apparente qui est dans une plage de 0,01 g/ml à 0,05 g/ml, la teneur en additif conducteur de la couche de matériau actif {3, (12, 15), (32, 33)} augmentant graduellement dans une direction (D) d'un côté de collecteur (3B) de la couche de matériau actif {3, (12, 15), (32, 33)} vers un côté de surface (3A) de la couche de matériau actif {3, (12, 15), (32, 33)}.
  4. Electrode de batterie {1, (12, 15), (32, 33)} selon l'une quelconque des revendications 1 à 3, dans laquelle
    la couche de matériau actif {3, (12, 15), (32, 33)} a une épaisseur dans une plage de 20 µm à 500 µm.
  5. Electrode de batterie {1, (12, 15), (32, 33)} selon l'une quelconque des revendications 1 à 4, dans laquelle
    la couche de matériau actif {3, (12, 15), (32, 33)} comprend deux sous-couches de matériau actif ou plus, et
    chacune des sous-couches de matériau actif a une épaisseur dans une plage de 10 µm à 100 µm.
  6. Electrode de batterie {1, (12, 15), (32, 33)} selon l'une quelconque des revendications 1 à 5, dans laquelle
    l'additif conducteur comprend du carbone.
  7. Procédé de fabrication d'une électrode de batterie {1, (12, 15), (32, 33)}, le procédé comprenant des étapes consistant à :
    préparer n types de pâtes comprenant chacune :
    un matériau actif,
    un additif conducteur, et
    un solvant,
    dans lequel la préparation est effectuée en utilisant n types des additifs conducteurs ayant différentes densités apparentes et n indique un entier égal à deux ou plus,
    appliquer les pâtes dans un ordre des densités apparentes des additifs conducteurs inclus à une surface (2A) d'un collecteur {2 ; (11, 11a), 14 ; (31 : 31a, 31b)}, dans lequel l'ordre est de la plus grande à la plus petite,
    former, de ce fait, un film enduit comprenant n sous-couches, dans lequel n indique un entier égal à deux ou plus, et
    presser le film enduit dans une direction d'empilage (D).
  8. Procédé de fabrication d'une électrode de batterie {1, (12, 15),
    (32, 33)}, le procédé comprenant des étapes consistant à :
    préparer n types de pâtes comprenant chacune :
    un matériau actif,
    m types d'additifs conducteurs ayant différentes densités apparentes, et
    un solvant,
    dans lequel la préparation est effectuée en modifiant les rapports de mélange des additifs conducteurs, et m et n indiquent chacun un entier égal à deux ou plus,
    appliquer les pâtes dans un ordre des moyennes des densités apparentes des additifs conducteurs à une surface (2A) d'un collecteur {2 ; (11, 11 a), 14 ; (31 : 31a, 31b)},
    dans lequel l'ordre est de la plus grande à la plus petite, et
    dans lequel les moyennes des densités apparentes sont pondérées par les rapports de mélange des additifs conducteurs, former, de ce fait, un film enduit comprenant n sous-couches,
    dans lequel n indique un entier égal à deux ou plus, et presser le film enduit dans une direction d'empilage (D).
  9. Procédé de fabrication de l'électrode de batterie {1, (12, 15), (32, 33)} selon l'une quelconque des revendications 7 et 8, dans lequel
    l'application de la pâte de matériau actif utilise un jet d'encre.
  10. Batterie secondaire ion-lithium (10, 30, 50), comprenant :
    au moins une couche de pile électrique (16, 36) comprenant : une électrode positive (1, 12, 32), une couche d'électrolyte (13, 35) et une électrode négative (1, 15, 33) qui sont empilées dans cet ordre,
    dans laquelle au moins l'une de l'électrode positive (1, 12, 32) et de l'électrode négative (1, 15, 33) est l'électrode de batterie {1, (12, 15), (32, 33)} selon l'une quelconque des revendications 1 à 6.
  11. Batterie secondaire ion-lithium (10, 30, 50) selon la revendication 10, dans laquelle la couche d'électrolyte (13, 35) comprend au moins l'un :
    d'un électrolyte liquide, et
    d'un électrolyte polymère comprenant au moins l'un :
    d'un électrolyte en gel comprenant une solution électrolytique, et
    d'un électrolyte polymère solide exempt de solution électrolytique.
  12. Batterie secondaire ion-lithium (10, 30, 50) selon la revendication 11, dans laquelle
    la couche d'électrolyte (13, 35) comprend l'électrolyte polymère solide.
  13. Module de batterie (300), comprenant :
    la batterie secondaire ion-lithium (10, 30, 50) selon l'une quelconque des revendications 10 à 12.
  14. Véhicule (400), comprenant :
    l'un
    de la batterie secondaire ion-lithium (10, 30, 50) selon l'une quelconque des revendications 10 à 12, et
    du module de batterie (300) selon la revendication 13.
EP08011026A 2007-06-20 2008-06-18 Électrode de batterie Not-in-force EP2006941B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007162916A JP5167703B2 (ja) 2007-06-20 2007-06-20 電池用電極

Publications (2)

Publication Number Publication Date
EP2006941A1 EP2006941A1 (fr) 2008-12-24
EP2006941B1 true EP2006941B1 (fr) 2010-05-26

Family

ID=39798071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08011026A Not-in-force EP2006941B1 (fr) 2007-06-20 2008-06-18 Électrode de batterie

Country Status (6)

Country Link
US (1) US8697289B2 (fr)
EP (1) EP2006941B1 (fr)
JP (1) JP5167703B2 (fr)
KR (1) KR101014969B1 (fr)
CN (1) CN101330138B (fr)
DE (1) DE602008001332D1 (fr)

Families Citing this family (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009064714A (ja) * 2007-09-07 2009-03-26 Toyota Motor Corp 電極体およびそれを用いたリチウム二次電池
WO2009120294A1 (fr) 2008-03-24 2009-10-01 Lightening Energy Batterie modulaire, dispositif d'interconnexion pour de telles batteries et procédés associés aux batteries modulaires
US8722248B2 (en) * 2008-08-26 2014-05-13 Biotronik Crm Patent Ag Active element and battery as well as method for the production thereof
US20100099026A1 (en) * 2008-10-20 2010-04-22 Samsung Electronics Co., Ltd. Electrode ink composition for ink-jet printing, and electrode and secondary battery manufactured by using the same
WO2010082323A1 (fr) * 2009-01-14 2010-07-22 トヨタ自動車株式会社 Batterie rechargeable lithium-ion et processus de production de la batterie lithium-ion
DE102009000660A1 (de) * 2009-02-06 2010-08-12 Robert Bosch Gmbh Batteriemodul
CN101859885A (zh) 2009-04-09 2010-10-13 上海比亚迪有限公司 一种电池极片,其制备方法及包含该极片的二次电池
US9083055B2 (en) * 2009-05-08 2015-07-14 Samsung Sdi Co., Ltd. Electrode with plural active material layers with different amounts of conductive material for rechargeable lithium battery and method for manufacturing the same and rechargeable lithium battery including the electrode
JP5810479B2 (ja) * 2009-05-26 2015-11-11 日産自動車株式会社 リチウムイオン二次電池用の電極構造、リチウムイオン二次電池およびリチウムイオン二次電池用の電極の製造方法
US9281539B2 (en) * 2009-07-14 2016-03-08 Kawasakai Jukogyo Kabushiki Kaisha Electrical storage device including fiber electrode, and method of fabricating the same
JP5333011B2 (ja) * 2009-07-28 2013-11-06 トヨタ自動車株式会社 固体電池およびその製造方法
US8822064B2 (en) * 2009-12-31 2014-09-02 Lightening Energy Modular battery with polymeric compression sealing
US20110200867A1 (en) * 2010-02-16 2011-08-18 Lightening Energy Modular battery with battery cell having bimetallic end plates
JP2011171177A (ja) * 2010-02-19 2011-09-01 Toyota Central R&D Labs Inc リチウム二次電池
US9263730B2 (en) * 2010-05-12 2016-02-16 Kabushiki Kaisha Toyota Jidoshokki Electrode for lithium-ion secondary battery and manufacturing process for the same
US9236746B2 (en) * 2010-08-27 2016-01-12 Nissan Motor Co., Ltd. Bipolar battery control device for adjusting a voltage or capacitance in cells
KR101138562B1 (ko) * 2010-08-31 2012-05-10 삼성전기주식회사 전극 구조체 및 그 제조 방법, 그리고 상기 전극 구조체를 구비하는 에너지 저장 장치
JP5585834B2 (ja) * 2010-09-17 2014-09-10 トヨタ自動車株式会社 リチウムイオン二次電池
CN103119775B (zh) * 2010-09-30 2015-06-10 川崎重工业株式会社 以质子为嵌入物的二次电池用负极及具备该负极的二次电池
JP5699754B2 (ja) * 2011-03-31 2015-04-15 Tdk株式会社 活物質、電極、リチウムイオン二次電池、及び、活物質の製造方法
JP5578282B2 (ja) * 2011-06-28 2014-08-27 株式会社村田製作所 蓄電デバイスおよびその製造方法
JP5896218B2 (ja) * 2012-02-23 2016-03-30 トヨタ自動車株式会社 密閉型非水電解質二次電池
JP5601361B2 (ja) * 2012-10-12 2014-10-08 日産自動車株式会社 電池用電極
JP6271506B2 (ja) * 2013-03-11 2018-01-31 三洋電機株式会社 非水電解質二次電池用正極及び非水電解質二次電池
WO2014156095A1 (fr) 2013-03-29 2014-10-02 三洋電機株式会社 Batterie secondaire à électrolyte non aqueux
JP6108166B2 (ja) * 2013-06-28 2017-04-05 トヨタ自動車株式会社 二次電池用電極
KR20160062025A (ko) * 2013-09-26 2016-06-01 도판 인사츠 가부시키가이샤 비수 전해액 이차 전지용 부극, 비수 전해액 이차 전지 및 비수 전해액 이차 전지용 부극의 제조 방법
JP6350150B2 (ja) * 2013-09-30 2018-07-04 株式会社Ｇｓユアサ 蓄電素子
JP2015072753A (ja) * 2013-10-02 2015-04-16 トヨタ自動車株式会社 リチウムイオン二次電池
US9985313B2 (en) * 2014-01-02 2018-05-29 Wildcat Discovery Technologies, Inc. Solid state electrolyte and electrode compositions
US10270086B2 (en) 2014-01-31 2019-04-23 Sanyo Electric Co., Ltd. Nonaqueous-electrolyte secondary-battery negative electrode
KR102443738B1 (ko) * 2014-03-28 2022-09-15 데이진 가부시키가이샤 섬유상 탄소를 포함하는 비수 전해질 2 차 전지용 전극 합제층, 그것을 포함하는 비수 전해질 2 차 전지용 전극 및 비수 전해질 2 차 전지
JP5963012B2 (ja) 2014-04-21 2016-08-03 トヨタ自動車株式会社 非水電解質二次電池
JP2016035883A (ja) * 2014-08-05 2016-03-17 東洋インキＳｃホールディングス株式会社 伸縮性導電体およびその製造方法
DE112015003717T5 (de) * 2014-08-11 2017-05-04 Gs Yuasa International Ltd. Positive Elektrodenplatte für Energiespeichergerät mit nichtwässrigem Elektrolyt, und Energiespeichergerät mit nichtwässrigem Elektrolyt
KR20160020237A (ko) * 2014-08-13 2016-02-23 삼성에스디아이 주식회사 양극재, 이를 포함하는 양극, 및 상기 양극을 포함하는 리튬 전지
DE102014216423A1 (de) * 2014-08-19 2016-02-25 Robert Bosch Gmbh Elektrode für einen Energiespeicher und Verfahren zur Herstellung
JP6237546B2 (ja) 2014-09-11 2017-11-29 トヨタ自動車株式会社 非水電解質二次電池
JP6783330B2 (ja) 2016-06-30 2020-11-11 ワイルドキャット・ディスカバリー・テクノロジーズ・インコーポレイテッドＷｉｌｄｃａｔ Ｄｉｓｃｏｖｅｒｙ Ｔｅｃｈｎｏｌｏｇｉｅｓ， Ｉｎｃ． 固体電解質組成物
US10461360B2 (en) 2016-06-30 2019-10-29 Wildcat Discovery Technologies, Inc. Electrode compositions for solid-state batteries
KR102484406B1 (ko) 2016-11-01 2023-01-02 삼성에스디아이 주식회사 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지
KR102417267B1 (ko) 2016-11-02 2022-07-04 삼성에스디아이 주식회사 리튬 이차 전지
WO2018098176A1 (fr) 2016-11-23 2018-05-31 Wildcat Discovery Technologies, Inc. Compositions d'électrolyte solide pour cellules électrochimiques
US20180261827A1 (en) * 2017-03-08 2018-09-13 Ricoh Company, Ltd. Electrode, electrode element, nonaqueous electrolytic power storage device
CN110199413B (zh) * 2017-06-23 2022-05-24 株式会社Lg化学 用于锂二次电池的正极和包括该正极的锂二次电池
US11374212B2 (en) * 2017-06-27 2022-06-28 Lg Energy Solution, Ltd. Multilayer positive electrode for lithium secondary battery and method for manufacturing the same
US11993710B2 (en) 2017-06-30 2024-05-28 Wildcat Discovery Technologies, Inc. Composite solid state electrolyte and lithium ion battery containing the same
JP7029921B2 (ja) * 2017-10-10 2022-03-04 日産自動車株式会社 非水電解質二次電池用電極
US11990278B2 (en) * 2017-11-02 2024-05-21 Tesla, Inc. Compositions and methods for multilayer electrode films
KR102417774B1 (ko) 2018-04-20 2022-07-05 삼성에스디아이 주식회사 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지
KR102417773B1 (ko) 2018-04-27 2022-07-05 삼성에스디아이 주식회사 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지
CN113410469B (zh) * 2018-10-31 2022-06-03 宁德时代新能源科技股份有限公司 一种负极极片和二次电池以及电动汽车
CN111200159B (zh) * 2018-11-16 2021-03-23 宁德时代新能源科技股份有限公司 一种电池
US11329282B2 (en) * 2019-02-26 2022-05-10 Bettergy Corp. Rechargeable batteries and methods of making same
US20220190320A1 (en) * 2019-03-28 2022-06-16 Panasonic Intellectual Property Management Co., Ltd. Nonaqueous electrolyte secondary battery negative electrode and nonaqueous electrolyte secondary battery
CN113994513B (zh) * 2020-02-19 2023-02-21 宁德新能源科技有限公司 正极极片与包含其的电化学装置及电子装置
CN112705150B (zh) * 2020-11-05 2022-12-23 中国恩菲工程技术有限公司 复合材料制备装置与方法
KR20230030409A (ko) * 2021-08-25 2023-03-06 삼성에스디아이 주식회사 리튬 이차 전지용 전극 및 이를 포함하는 리튬 이차 전지
EP4411853A1 (fr) * 2021-09-28 2024-08-07 Panasonic Energy Co., Ltd. Batterie secondaire à électrolyte non aqueux
CN114497566A (zh) * 2022-01-25 2022-05-13 珠海冠宇电池股份有限公司 一种正极片和锂离子电池
CN115084526B (zh) * 2022-07-08 2024-02-20 珠海冠宇电池股份有限公司 正极片和电池
WO2024138765A1 (fr) * 2022-12-31 2024-07-04 宁德新能源科技有限公司 Appareil électrochimique et appareil électronique le comprenant

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5360686A (en) * 1993-08-20 1994-11-01 The United States Of America As Represented By The National Aeronautics And Space Administration Thin composite solid electrolyte film for lithium batteries
JPH07320987A (ja) 1994-05-27 1995-12-08 Fuji Elelctrochem Co Ltd 電極構造
JPH09320569A (ja) 1996-05-30 1997-12-12 Ricoh Co Ltd 非水系２次電池
JP3281819B2 (ja) * 1996-09-30 2002-05-13 三洋電機株式会社 非水電解質二次電池
JPH11250900A (ja) 1998-02-26 1999-09-17 Sony Corp 非水電解液二次電池用電極の製造方法、製造装置、および電極ならびにこの電極を用いた非水電解液二次電池
JP2000011995A (ja) * 1998-06-24 2000-01-14 Furukawa Electric Co Ltd:The 二次電池用正極板とその製造方法
KR100359054B1 (ko) * 2000-04-22 2002-11-07 한국과학기술연구원 도전성 슬러리로 표면처리된 금속산화물 양극, 그제조방법 및 이를 이용한 리튬이차전지
DE60140163D1 (de) * 2000-08-28 2009-11-26 Nissan Motor Wiederaufladbare Lithiumionenbatterie
US20030031933A1 (en) * 2001-08-08 2003-02-13 Shembel Elena M. Solid polymer electrolyte lithium battery
JP3585122B2 (ja) 2001-09-14 2004-11-04 松下電器産業株式会社 非水系二次電池とその製造法
JP2003297337A (ja) * 2002-03-29 2003-10-17 Tdk Corp 電極構造物およびその製造方法、二次電池
KR100659814B1 (ko) 2003-04-23 2006-12-19 미츠이 마이닝 & 스멜팅 콤파니 리미티드 비수 전해액 이차전지용 부극 및 그 제조방법 및 비수 전해액 이차전지
CN100340015C (zh) 2003-04-23 2007-09-26 三井金属矿业株式会社 非水电解液二次电池用负极、其制造方法及非水电解液二次电池
WO2005006469A1 (fr) 2003-07-15 2005-01-20 Itochu Corporation Structure de collecte de courant et structure d'electrode
CN1305164C (zh) 2003-12-26 2007-03-14 比亚迪股份有限公司 一种非水电解液锂二次电池
JP2007005717A (ja) * 2005-06-27 2007-01-11 Sanyo Electric Co Ltd 電気化学素子

Also Published As

Publication number Publication date
KR20080112134A (ko) 2008-12-24
DE602008001332D1 (de) 2010-07-08
JP2009004181A (ja) 2009-01-08
CN101330138A (zh) 2008-12-24
US20080318133A1 (en) 2008-12-25
CN101330138B (zh) 2010-12-01
KR101014969B1 (ko) 2011-02-16
EP2006941A1 (fr) 2008-12-24
US8697289B2 (en) 2014-04-15
JP5167703B2 (ja) 2013-03-21

Similar Documents

Publication Publication Date Title
EP2006941B1 (fr) Électrode de batterie
EP2250689B1 (fr) Batterie à électrode de batterie et son procédé de fabrication
EP2446502B1 (fr) Accumulateur bipolaire
US8852295B2 (en) Secondary battery and method of producing the secondary battery
US10177387B2 (en) Bipolar battery current collector that contracts to interrupt a flow of electric current in a direction thereof and bipolar battery
EP2327119B1 (fr) Accumulateur bipolaire, procédé de fabrication de l accumulateur bipolaire, électrode bipolaire, procédé de fabrication de l électrode bipolaire et batterie assemblée
EP2579363A1 (fr) Électrode négative pour batterie secondaire et procédé de fabrication de celle-ci
JP5601361B2 (ja) 電池用電極
EP1881546A2 (fr) Electrode positive pour une batterie secondaire à électrolyte non aqueux, et son procédé de fabrication
JP2007109636A (ja) 電池用電極
JP5420852B2 (ja) リチウムイオン電池用電極
JP4433783B2 (ja) バイポーラ電池
JP2009009858A (ja) リチウムイオン二次電池用電極
JP4424079B2 (ja) ポリマー電池、ポリマー電池の製造方法、組電池、および、これらを搭載した車両
JP2011171185A (ja) 二次電池用集電体
JP5228273B2 (ja) リチウムイオン二次電池
JP2007048526A (ja) 二次電池および組電池、並びにこれらを搭載した車両
JP2008016381A (ja) 電池用電極
JP5569229B2 (ja) リチウムイオン二次電池のニッケル含有正極用集電体
JP2005149893A (ja) バイポーラ電池

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20080618

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

AKX Designation fees paid

Designated state(s): DE FR GB

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 602008001332

Country of ref document: DE

Date of ref document: 20100708

Kind code of ref document: P

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20110301

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602008001332

Country of ref document: DE

Effective date: 20110228

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20150609

Year of fee payment: 8

Ref country code: GB

Payment date: 20150617

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20150608

Year of fee payment: 8

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602008001332

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160618

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160630

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160618